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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5336) DataNode should not output 'StartupProgress' metrics
Date Fri, 11 Oct 2013 05:46:42 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13792365#comment-13792365

Chris Nauroth commented on HDFS-5336:

This is caused by reliance on static initialization coming back to bite us.  The startup progress
metrics get registered during static initialization of the {{NameNode}} class.  Any process
accessing that class will register the startup progress metrics as a side effect.  For example,
{{DatanodeWebHdfsMethods}} calls {{NameNode#getHttpAddress}}.  I don't know yet how the YARN
code triggered it.

> DataNode should not output 'StartupProgress' metrics
> ----------------------------------------------------
>                 Key: HDFS-5336
>                 URL: https://issues.apache.org/jira/browse/HDFS-5336
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.1.0-beta
>         Environment: trunk
>            Reporter: Akira AJISAKA
>            Assignee: Akira AJISAKA
>            Priority: Minor
>              Labels: metrics
> I found the following metrics output from DataNode.
> {code}
> 1381355455731 default.StartupProgress: Hostname=trunk, ElapsedTime=0, PercentComplete=0.0,
LoadingFsImageCount=0, LoadingFsImageElapsedTime=0, LoadingFsImageTotal=0, LoadingFsImagePercentComplete=0.0,
LoadingEditsCount=0, LoadingEditsElapsedTime=0, LoadingEditsTotal=0, LoadingEditsPercentComplete=0.0,
SavingCheckpointCount=0, SavingCheckpointElapsedTime=0, SavingCheckpointTotal=0, SavingCheckpointPercentComplete=0.0,
SafeModeCount=0, SafeModeElapsedTime=0, SafeModeTotal=0, SafeModePercentComplete=0.0
> {code}
> DataNode should not output 'StartupProgress' metrics because the metrics shows the progress
of NameNode startup.

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